【摘要】 采用沸石和陶粒组配成复合介质，以模拟城市初期径流中氨氮和磷酸盐为实验对象，研究复合介质对模拟初期径流中氮磷的同步去除效果，考察沸石和陶粒固定质量配比下影响同步去除氮磷的因素，包括复合介质总投加量、吸附时间、初始pH值和污染物初始浓度等，进行沸石和陶粒质量配比的优化。结果表明：在设定实验条件下，随着复合介质投加量增加，氨氮和磷酸盐去除率增大；当投加量增加至200 g/L以上时，去除率增加趋势变缓。复合介质对氨氮和磷酸盐的吸附去除具有“快速吸附，缓慢平衡”的特征，在设定的实验条件下，吸附时间1.5 h为宜；在初始pH值位于中性或偏碱性条件下，复合介质同步去除氮磷的效果更佳；复合介质中沸石和陶粒的最佳质量配比为7:12。分析表明复合介质吸附初期径流中氨氮的机制为离子交换，去除磷酸盐的机制则为化学沉淀。更多还原

【Abstract】 A composite medium composed of zeolite & ceramsite is used to study the effect of composite medium on the simultaneous removal of nitrogen and phosphorus in the simulated urban initial runoff, taking ammonia nitrogen and phosphate in the simulated urban initial runoff as the experimental objects, and the factors affecting the simultaneous removal of nitrogen and phosphorus under the fixed mass ratio of zeolite & ceramsite are investigated, including the total dosage of composite medium, adsorption time, initial p H value and initial concentration of pollutants, the mass ratio of zeolite & ceramsite is optimized. The results show that under the set experimental conditions, the removal rate of ammonia nitrogen and phosphate are increased with the increase of the dosage of composite media; when the dosage increases to more than 200 g/L, the increasing trend of removal rate becomes slow. The adsorption and removal of ammonia nitrogen and phosphate in the composite medium has the characteristics of rapid adsorption and slow equilibrium. Under the set experimental conditions, the adsorption time is 1.5 h; when the initial p H value is neutral or slightly alkaline, the effect of simultaneous removal of nitrogen and phosphorus by composite media is better; the best mass ratio of zeolite & ceramsite in composite media is 7:12. The analysis shows that the mechanism of adsorption of ammonia nitrogen in the initial runoff by composite media is ion exchange, and the mechanism of phosphate removal is chemical precipitation.更多还原